One of the lousy things about getting old (prepare yourself!) is that you can be

Question

One of the lousy things about getting old (prepare yourself!) is that you can be both near-sighted and farsighted at once. Some original defect in the lens of your eye may cause you to only be able to focus on some objects a limited distance away (near-sighted). At the same time, as you age, the lens of your eye becomes more rigid and less able to change its shape. This will stop you from being able to focus on objects that are too close to your eye (far-sighted). Correcting both of these problems at once can be done by using bi-focals, or by placing two lenses in the same set of frames. An old physicist instructor can only focus on objects that lie at distance between 0.49 meters and 5.1 meters. 1) What type of lens is needed to correct his nearsightness? (1) converging . (2) diverging inthe number that coresponds to yournswer Suomt 2 Your submissions: 2 Computed value: 2 Feedback: Correct! Submitted: Friday, April 15 at 3:53 PM 2) What type of lens is needed to correct his farsightness? (1) converging . (2) diverging type in the number that corresponds to your answer Submit Your submissions: 1 . Computed value: Submitted: Friday, April 15 at 3:53 PM Feedback: Correct!

Explanation / Answer

Question 4:

For farsightedness,

1/f = 1/infinity + 1/-(5.1-0.02)

1/f = - 1/5.08

P = 1/f = - 0.2 Diopters

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